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Net production of N2O (white bars) and NH4+ (hatched bars) in chemostat cultures of S. loihica strain PV-4 with NO2−:NO3− ratios varying from 0 to 3 in the feed solution. The feed solution contained 5 mM lactate and combinations of NO2− and NO3− with a total N oxyanion concentration of 2.0 mM. The N oxide(s) were supplied to the reactor at ∼40 μmol h−1. Each bar represents the averages from two samples taken from separate reactors, with error bars representing the standard deviations.
